Supplemental Information (Other Noncurrent Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Liabilities, Noncurrent [Abstract]
Pension benefits	$ 1,234.8	$ 914.5
Postretirement benefits	107.3	101.0
Other employee benefits	123.0	100.2
Contingencies related to uncertain tax positions	112.1	154.1
Advance payments	32.7	34.9
Environmental liabilities	80.3	75.1
Contingent proceeds subject to Homecare retenders	140.8	0
Derivative instruments	12.0	3.2
Asset retirement obligation	71.2	63.4
Other	66.7	53.6
Other noncurrent liabilities	$ 1,980.9	$ 1,500.0